Alright, here's the deal. General Mills is offering a free movie ticket to Star Wars Rogue One (up to $12) with the purchase of 3 Reese's Puffs 13oz, Cinnamon Toast Crunch 12.2oz, Trix 10.7oz, Cookie Crisp 11.25oz or Honey Nut Cheerios 12.25oz boxes. You submit your receipt via email or website submission and they email you a code to redeem the ticket.
Publix (in the Southeast) has BOGO free on Cheerios 11.25-14.1oz boxes at $3.23 a box through 12/14. (The BOGO may have applied to other cereal brands but I didn't look as they're junk food to me.) Publix BOGO free is actually half off as they do not require purchase of two items to get the discount!
They also have a digital coupon using their app for $1 off 2 boxes of General Mills Cereal (you enter your phone number at checkout)!
$3.23x1.5=$4.85 3 boxes at half off
-1.00 digital coupon on 2 boxes of GM cereal
=$3.85 before tax!
So, in total, I got three boxes of Honey Nut Cheerios and a free ticket to Rogue one for $3.85 plus tax! Literally a sweet deal!
There may be other retailers with different prices on cereal and other coupons out there in the wild that you can apply. If you find a way to make this sweeter or work at other retailers with other coupons, let me know and I'll update the original post.